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| 型号： | TMP401AIDGKR |
| 厂商： | Texas Instruments |
| 文件页数： | 20/28页 |
| 文件大小： | 881K |
| 描述： | IC REMOTE TEMP SENSOR PROG 8MSOP |
| 标准包装： | 1 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±3°C 本地（最大），±5°C 远程（最大） |
| 拓扑： | ADC，比较器，寄存器库 |
| 输出类型： | 2 线 SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 1079 (CN2011-ZH PDF) |
| 其它名称： | 296-20710-6 |
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TMP401
SBOS371A AUGUST 2006 REVISED OCTOBER 2007
www.ti.com
20
REMOTE SENSING
The TMP401 is designed to be used with either discrete
transistors or substrate transistors built into processor
chips and ASICs. Either NPN or PNP transistors can be
used, as long as the base-emitter junction is used as the
remote temperature sense. Either a transistor or diode
connection can also be used (see Figure 11, Basic
Connections).
Errors in remote temperature sensor readings will be the
consequence of the ideality factor and current excitation
used by the TMP401 versus the manufacturers specified
operating current for a given transistor. Some
manufacturers specify a high-level and low-level current
for the temperature-sensing substrate transistors. The
TMP401 uses 6礎 for I
LOW
and 120礎 for I
HIGH
.
The ideality factor (? is a measured characteristic of a
remote temperature sensor diode as compared to an ideal
diode. The ideality factor for the TMP401 is trimmed to be
1.008. For transistors whose ideality factor does not match
the TMP401, Equation (1) can be used to calculate the
temperature error. Note that for the equation to be used
correctly, actual temperature (癈) must be converted to
Kelvin (癒).
T
ERR
+
h * 1.008
1.008
273.15 ) T(癈)
Where:
?= Ideality factor of remote temperature sensor.
T(癈) = actual temperature.
T
ERR
= Error in TMP401 reading due to ?` 1.008.
Degree delta is the same for 癈 and 癒.
For ?= 1.004 and T(癈) = 100癈:
T
ERR
+
(
1.004*1.008
)
1.008
273.15)100癈
T
ERR
+ * 1.48癈
If a discrete transistor is used as the remote temperature
sensor with the TMP401, the best accuracy can be
achieved by selecting the transistor according to the
following criteria:
1. Base-emitter voltage > 0.25V at 6礎, at the highest
sensed temperature.
2. Base-emitter voltage < 0.95V at 120礎, at the
lowest sensed temperature.
3. Base resistance < 100&.
4. Tight control of V
BE
characteristics indicated by
small variations in h
FE
(that is, 50 to 150).
Based on these criteria, two recommended small-signal
transistors are the 2N3904 (NPN) or 2N3906 (PNP).
MEASUREMENT ACCURACY AND THERMAL
CONSIDERATIONS
The temperature measurement accuracy of the TMP401
depends on the remote and/or local temperature sensor
being at the same temperature as the system point being
monitored. Clearly, if the temperature sensor is not in good
thermal contact with the part of the system being
monitored, then there will be a delay in the response of the
sensor to a temperature change in the system. For remote
temperature sensing applications using a substrate
transistor (or a small, SOT23 transistor) placed close to the
device being monitored, this delay is usually not a concern.
The local temperature sensor inside the TMP401 monitors
the ambient air around the device. The thermal time
constant for the TMP401 is approximately two seconds.
This constant implies that if the ambient air changes
quickly by 100癈, it would take the TMP401 about 10
seconds (that is, five thermal time constants) to settle to
within 1癈 of the final value. In most applications, the
TMP401 package is in electrical and therefore thermal
contact with the PCB, as well as subjected to forced
airflow. The accuracy of the measured temperature
directly depends on how accurately the PCB and forced
airflow temperatures represent the temperature that the
TMP401 is measuring. Additionally, the internal power
dissipation of the TMP401 can cause the temperature to
rise above the ambient or PCB temperature. The internal
power dissipated as a result of exciting the remote
temperature sensor is negligible because of the small
currents used. For a 5.5V supply and maximum
conversion rate of eight conversions per second, the
TMP401 dissipates 1.82mW (PD
IQ
= 5.5V x 330礎). If both
the ALERT
/THERM2
and THERM
pins are each sinking
1mA, an additional power of 0.8mW is dissipated
(PD
OUT
= 1mA ?.4V + 1mA ?.4V = 0.8mW). Total power
dissipation is then 2.62mW (PD
IQ
+ PD
OUT
) and, with an
q
JA
of 150癈/W, causes the junction temperature to rise
approximately 0.393癈 above the ambient.
(1)
(2)
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相关代理商/技术参数 |
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| TMP401AIDGKRG4 | 功能描述:板上安装温度传感器 Programmable Temp Sensor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| TMP401AIDGKT | 功能描述:板上安装温度传感器 +/-2 Deg Prog Remote Local Temp Sensor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| TMP401AIDGKTG4 | 功能描述:板上安装温度传感器 +/-2 Deg Prog Remote Local Temp Sensor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| TMP411 | 制造商:BB 制造商全称:BB 功能描述:【1C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction |
| TMP411_07 | 制造商:BB 制造商全称:BB 功能描述:【1∑C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction |
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